After the Battle of Daliang City, the reputation of the Tang army in Sanqin was greatly enhanced, and many Sui army passes and cities along the way opened the city and surrendered, and the Tang army was like a bamboo. is a little stubborn, as long as Li Shimin goes out, he will basically get it done quickly.

On this day, the Tang army came to a dangerous pass, this dangerous pass is called "Jianmen Pass", the pass is built between two straight cliffs, it is really "a husband when the pass is not opened". In front of Jianmen Pass, due to the narrow mountain road, the army could not spread at all, so Li Shimin organized the Tang army to attack for three days, injuring many soldiers, but still unable to break the city.

When Li Shimin was in a hurry in the center of the military tent, the eldest grandson Wuji walked in with Xia Xue. Xia Xue whispered to Li Shimin that he would find a way to sneak into Jianmen Pass tonight, and then burn its grain and grass, if the grain and grass were burned, the Sui army would have no fighting spirit, and the Tang army would see that Jianmen Pass was on fire, so they could take the opportunity to attack the city and definitely take Jianmen Pass.

Li Shimin said worriedly: "Eldest grandson girl, the enemy army is on strict guard day and night when the sword gate is closed, if you want to sneak in from the city wall, it is basically impossible?" ”

"I'll find a way to sneak into the pass from the cliffs on both sides of the Sword Gate."

"The cliffs on both sides of the Sword Gate Pass are extremely steep, and there is no grass, so it is impossible to climb at all, how can the eldest grandson girl climb up?"

"King Qin, please rest assured, I have a way to enter, you only need to see the fire in the pass and immediately attack the city, and pay attention to secrecy." Xia Xue said confidently.

Seeing Xia Xue's confident appearance, Li Shimin nodded suspiciously and agreed to this risky plan, anyway, there is no other better plan at present.

"Eldest grandson girl, you must pay attention to safety! If it doesn't work out, don't force it, you must remember: 'safety first', I'm waiting for you to return safely! Li Shimin's eyes were full of concern.

"Well, please rest assured, King Qin, I will pay attention!" Looking at Li Shimin's eyes full of concern, Xia Xue's heart warmed slightly.

Although the eldest grandson Wuji was very confident in this fairy sister, he couldn't help but feel a chill down his spine when he looked at the steep cliff like a knife and axe outside. He also told Xia Xueqian to pay attention to safety and not to take too many risks. Xia Xue comforted the eldest grandson Wuji and warned Li Shimin and the eldest grandson Wuji that this plan would be kept strictly confidential and should not be told to anyone.

At night, the moon is dark and the wind is high, and it is pitch black. Like an agile spirit monkey, Xia Xue used the catapult hook, rope dagger, and her superb climbing skills to quickly climb the cliff to the right of the extremely steep Jianmen Pass, and then quietly sneaked into the Jianmen Pass from the cliff.

The Sui army in the Jianmen Pass never dreamed that someone could climb such a steep and grassless cliff.

After infiltrating the Sword Gate Pass, Xia Xue successfully found the granary in the city, killed the five guards guarding the granary with a tranquilizer pistol, and burned the granary with a fire with the help of the strong wind, and then quietly lurked in the darkness near the granary.

The smoke grew thicker, and the fire even warmed the air around the granary. Occasionally, you can see huge tongues of fire, flying like dragons and snakes behind the roofs. The cracking of walls and roofs, the sudden collapse, the roar of flames, the screams and shouts of the people, the clouds of smoke that were sometimes turbulent and endless—sometimes rising into the air, mixed with bright sparks, black smoke billowing and flashing out of the Dao fire, here were the red pillars of fire in the shape of bundles, and the other was the golden flames of fish scales spreading along the walls.

Seeing the fire in Jianmen Pass, Li Shimin was overjoyed, and praised again and again in his heart: "The eldest grandson girl is really a god!" Don't lose being called a little fairy! "Immediately organize the Tang Army to launch a fierce attack on Jianmen Pass.

The Sui army in the pass couldn't help but be shocked when they saw the granary on fire, although they didn't know what the reason was, they could only put out the fire first. So the Sui army in the Jianmen Pass was like ants on a hot pot, making a mess, desperately fetching water to put out the fire.

However, due to the wind supporting the fire, the fire became more and more vigorous, and it was difficult to extinguish it for a while. In addition, the Tang army took the opportunity to storm the city, and the Sui army could only divide most of the officers and soldiers to go to the city to resist the Tang army's siege. Xia Xue continued to release cold arrows in the dark to shoot those fire-fighting soldiers, which made the Sui army in Jianmen Pass even more panicked, thinking that the Tang army had attacked Jianmen Pass, plus the granary was burned, and it was hopeless to hold on, and the army's morale was in turmoil for a while.

The sound of wind, fire, running, cries for help, screams, splashing water, shouting and killing, all these scenes, combined with the stimulation of heat waves and the smell of smoke, made the chaos in the city become a pot of porridge, and in less than an hour, Jianmen Pass was broken by the Tang army.